Order and chaos near equilibrium points in the potential of rotating highly irregular-shaped celestial bodies

Order and chaos near equilibrium points in the potential of rotating highly irregular-shaped celestial bodies
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旋转高度不规则形状天体的势平衡点附近的有序和混沌

DOI:
10.1007/s11071-015-2322-8
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发表时间:
2014-03
期刊:
影响因子:
5.6
通讯作者:
Zhang Zhibin
Zhang Zhibin
中科院分区:
工程技术2区
文献类型:
--
作者:
Jiang Yu;Baoyin Hexi;Wang Xianyu;Yu Yang;Li Hengnian;Peng Chao;Zhang Zhibin

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从动力系统理论的角度研究了高度不规则形状旋转天体势能平衡点附近运动的有序性和混沌性。当参数变化时,非简并平衡点的位置不断变化。平衡点附近的拓扑结构分为几种不同的情况。还讨论了平衡点处的分岔以及平衡点不同情况之间的拓扑传递。这些结论可以应用于各种旋转天体,无论是简单形状还是高度不规则形状,包括小行星、彗星、行星和行星的卫星,以帮助人们了解它们周围的动力学行为。小行星 216 Kleopatra、2063 Bacchus 和 25143 Itokawa 的应用是重要且有趣的:附属于小行星 216 Kleopatra 平衡点的特征值移动并始终属于相同的拓扑情况,而附属于小行星 2063 Bacchus 和 25143 Itokawa 的两个不同平衡点的特征值通过共振移动平衡点的情况下,复平面上的特征值会发生碰撞。小行星 216 Kleopatra 势的庞加莱剖面显示了大尺度轨道的混沌行为。
The order and chaos of the motion near equilibrium points in the potential of a rotating highly irregular-shaped celestial body are investigated from point of view of the dynamical system theory. The positions of the non-degenerate equilibrium points vary continuously when the parameter changes. The topological structures in the vicinity of equilibrium points are classified into several different cases. Bifurcations at equilibrium points and the topological transfers between different cases for equilibrium points are also discussed. The conclusions can be applied to all kinds of rotating celestial bodies, simple-shaped or highly irregular-shaped, including asteroids, comets, planets, and satellites of planets to help one to understand the dynamical behaviors around them. Applications to asteroids 216 Kleopatra, 2063 Bacchus, and 25143 Itokawa are significant and interesting: Eigenvalues affiliated to the equilibrium points for the asteroid 216 Kleopatra move and always belong to the same topological cases, while eigenvalues affiliated to two different equilibrium points for the asteroid 2063 Bacchus and 25143 Itokawa move through the resonant cases of equilibrium points, and the collision of eigenvalues in the complex plane occurs. Poincaré sections in the potential of the asteroid 216 Kleopatra show the chaos behaviors of the orbits in large scale.
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